Code Standard:

in ~/.vimrc add :set cc=80 to highlight 80th line

in the terminal grep -n '^.\\{81,\\}$' <file> prints line numbers of those over 80 chars

sed -i 's/\\s\\+$//' <file> removes all trailing white space

printf("This is a "
       "test of defining strings "
       "over multiple lines.");

printf("The backslash character \\
needs to be put at the end \\
and the strings must start at column 0.");